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Biology Biological Classification Introduction and Kingdom–Monera Single Correct MCQ
Published on: August 13, 2026

Specialized cells for fixing atmospheric nitrogen in Nostoc and Anabaena are

A
Nodules
B
Conidiospores
C
Heterocyst
D
Auxospores

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The correct answer is:
C

In cyanobacteria such as Nostoc and Anabaena, atmospheric nitrogen is fixed in specialized thick-walled cells called heterocysts. These cells provide a low-oxygen environment necessary for the enzyme nitrogenase to function.

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